Efficiency of the combination of three movable pulleys with a fixed pulley in ideal situation is :

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Solution

The correct option is A 1
In This case the Efficency of the combination in edal sytem is define by
$η = \frac{M A}{V R}$ , where MA=machincal advantage And VR=Velocity Ratio
in Ideal condition $M A = V R$
this gives $η = 1$

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